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Grails Runtime Exception

Error Details

Error 500: Executing action [index] of controller [anonandco.PublicProductController] caused exception: Runtime error executing action
Servlet: grails
URI: /grails/publicProduct/index.dispatch
Exception Message: Cannot get property 'category' on null object
Caused by: Cannot get property 'category' on null object
Class: PublicProductController
At Line: [12]
Code Snippet:

Stack Trace

java.lang.NullPointerException: Cannot get property 'category' on null object

at anonandco.PublicProductController.index(PublicProductController.groovy:12)
at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53)
at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.java:62)
at grails.plugin.springsecurity.web.SecurityRequestHolderFilter.doFilter(SecurityRequestHolderFilter.java:59)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:622)
at java.lang.Thread.run(Thread.java:748)